Unities, in drama, the three principles derived by French classicists from Aristotle’s Poetics; they require a play to have a single action represented as occurring in a single place and within the course of a day. These principles were called, respectively, unity of action, unity of place, and unity of time.

These three unities were redefined in 1570 by the Italian humanist Lodovico Castelvetro in his interpretation of Aristotle, and they are usually referred to as “Aristotelian rules” for dramatic structure. Actually, Aristotle’s observations on tragedy are descriptive rather than prescriptive, and he emphasizes only one unity, that of plot, or action.

In the French classical tragedy, the unities were adhered to literally and became the source of endless critical polemics. Disputes arose over such problems as whether a single day meant 12 or 24 hours and whether a single place meant one room or one city. Some believed that the action represented in the play should occupy no more time than that required for the play’s performance—about two hours. In spite of such severe restrictions, the great 17th-century French dramatists Pierre Corneille and Jean Racine, confining the crises of their characters’ lives to a single setting and a brief span of hours, produced a unique form of tragedy that derives its austere power from its singleness of concentration. The prestige of the unities continued to dominate French drama until the Romantic era, when it was destroyed, in an evening of catcalls and violence, with the opening of Victor Hugo’s Romantic tragedy Hernani (1830).

By contrast, the unities were of much less concern in Renaissance England. Christopher Marlowe, William Shakespeare, and Ben Jonson often included two or more plots in a play, mixed comedy and tragedy, and freely switched settings. Jonson, unusually among these playwrights, referred to the unities in the prologue to his Volpone (first performed 1605/06):

The laws of time, place, persons he observeth;From no needful rule he swerveth.

But in these lines Jonson (referring to himself as “he”) replaced unity of action with unity of “persons,” an acknowledgement that he used several plots in Volpone.

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In drama, the three rules French classicists designated for the structure of a play were known as the unities (in French, unites). They require a play to have a single action represented as occurring in a single place and within the course of a day. These principles were called, respectively, unity of action, unity of place, and unity of time. They were derived from the Greek philosopher Aristotle’s work Poetics and are sometimes referred to as the Aristotelian rules for dramatic structure, though in Aristotle’s observations on tragedy, he emphasized only one unity, that of plot, or action.